MiniRemote app: Only the crossfader in my iphone

The only control/knob that doesnt translate well to the computer keyboard or mouse, is the crossfader. If I could have a mini remote app that simply had a crossfader using the whole iphone screen, I could set up my iphone or ipad next to my laptop’s keyboard and I’d be set. For everything else, i’m cool with the mouse or keyboard shortcuts.

Thats my dream remote app…